/* mpi-cmp.c  -  MPI functions
 * Copyright (C) 1998, 1999 Free Software Foundation, Inc.
 *
 * This file is part of GnuPG.
 *
 * GnuPG is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * GnuPG is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */

#include "mpi-internal.h"

int mpi_cmp_ui(MPI u, unsigned long v)
{
    mpi_limb_t limb = v;

    mpi_normalize(u);
    if (!u->nlimbs && !limb) return 0;
    if (u->sign) return -1;
    if (u->nlimbs > 1) return 1;

    if (u->d[0] == limb)
        return 0;
    else if (u->d[0] > limb)
        return 1;
    else
        return -1;
}
// EXPORT_SYMBOL_GPL(mpi_cmp_ui);

static int do_mpi_cmp(MPI u, MPI v, int absmode)
{
    mpi_size_t usize;
    mpi_size_t vsize;
    int        usign;
    int        vsign;
    int        cmp;

    mpi_normalize(u);
    mpi_normalize(v);

    usize = u->nlimbs;
    vsize = v->nlimbs;
    usign = absmode ? 0 : u->sign;
    vsign = absmode ? 0 : v->sign;

    /* Compare sign bits.  */

    if (!usign && vsign) return 1;
    if (usign && !vsign) return -1;

    /* U and V are either both positive or both negative.  */

    if (usize != vsize && !usign && !vsign) return usize - vsize;
    if (usize != vsize && usign && vsign) return vsize + usize;
    if (!usize) return 0;
    cmp = mpihelp_cmp(u->d, v->d, usize);
    if (!cmp) return 0;
    if ((cmp < 0 ? 1 : 0) == (usign ? 1 : 0)) return 1;

    return -1;
}

int mpi_cmp(MPI u, MPI v) { return do_mpi_cmp(u, v, 0); }
// EXPORT_SYMBOL_GPL(mpi_cmp);

int mpi_cmpabs(MPI u, MPI v) { return do_mpi_cmp(u, v, 1); }
// EXPORT_SYMBOL_GPL(mpi_cmpabs);
